Histamine, mast cells, and chronic inflammation

Why some bodies remain stuck in "alert" mode

In recent years, a phenomenon has increasingly intrigued doctors.

Some people develop generalized hypersensitivity:

• they react to certain foods

• to drugs

• to odors or chemicals

• to heat or stress

• sometimes even with effort

And yet, conventional tests often come back normal.

Research is finally beginning to understand (especially after COVID) that one component of the immune system could play a central role in these situations: mast cells.

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Mast cells: the "alarms" of the immune system

Mast cells are immune cells found throughout the body:

• skin

• intestines

• lungs

• brain

• blood vessels

Their role is to quickly detect danger and trigger an inflammatory response.

When they become active, they release numerous molecules:

• histamine

• cytokines

• prostaglandins

• leukotrienes

These substances normally help fight infections and repair tissue.

But they also cause the symptoms we are familiar with:

• redness

• swelling

• itching

• inflammation

• fatigue

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When the defense system becomes too sensitive

Imagine a smoke detector.

If it is properly adjusted, it will activate when there is a fire.

But if it becomes too sensitive, it can be triggered:

• when you toast bread

• when steam rises from a shower

• or even when there is no danger

This is somewhat similar to what can happen with mast cells.

They may begin to respond to normal stimuli, such as:

• certain foods

• medicines

• temperature variations

• chemical odors

• stress

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A major scientific discovery

In 2015, researchers identified a specific receptor on mast cells called MRGPRX2.

This receptor allows certain substances to activate mast cells directly, without going through the usual allergic mechanisms.

When this receiver is activated:

• mast cells immediately release histamine

• inflammation starts very quickly

This can cause reactions similar to an allergy, even without allergic antibodies.

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Why these reactions can affect the entire body

Mast cells are present in almost all tissues.

When they become hyperactive, they can cause a wide variety of symptoms:

• skin: redness, hives

• intestines: digestive pain, diarrhea, or bloating

• nervous system: fatigue, brain fog

• cardiovascular system: palpitations or discomfort

• respiratory tract: tightness or irritation

This explains why some people have very diverse symptoms that are difficult to link together.

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The link between the nervous system and the immune system

One fascinating aspect is the relationship between mast cells and the nervous system.

These cells communicate directly with the nerves.

When a nerve is stimulated by:

• stress

• pain

• inflammation

it can release molecules that activate mast cells, creating a cycle of inflammation.

This is sometimes referred to as neuroimmune inflammation.

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Why these hypersensitivities seem to be increasing

Several modern factors could explain this increase:

1. Chronic inflammation

When the body remains in a state of inflammation for a long time, certain immune cells become more reactive.

2. The gut microbiota

The intestine plays a central role in regulating immunity.

An imbalance in the microbiota can amplify inflammation.

3. Persistent infections

Certain infections can keep the immune system in a state of constant alert: parasitic infections, fungi, yeast infections, mold, bacteria (Lyme disease), herpes viruses, etc.

4. Chronic stress

The autonomic nervous system directly influences immune activity.

5. Environmental exposures

Pollutants, endocrine disruptors, and chemicals may also play a role.

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When the immune system remains stuck in "survival" mode

When all these factors accumulate, the body can remain in a state of chronic alertness.

In this context:

• the nervous system remains activated

• mast cells become more sensitive

• the inflammation persists

The body can then enter a cycle where every small stimulus triggers an excessive reaction.

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Why these discoveries are changing our view of certain diseases

These mechanisms could help to better understand several situations that are often poorly explained:

• multiple hypersensitivities

• food intolerances

• unexplained reactions to medications

• chronic fatigue

• certain persistent inflammations

Research in this field is progressing rapidly, and mast cells are now considered to play a central role in many modern inflammatory diseases. It's amazing how treating hyperhistamine reduces cases of chronic inflammation much more effectively than turmeric, for example.

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The encouraging point

The immune system has a great capacity for adaptation.

When the body regains a better balance:

• inflammation may decrease

• mast cells may become less reactive again

• the nervous system can return to a calmer state of functioning

That is why our customers are increasingly interested in:

• microbiota health

• reduction of inflammation

• regulation of the nervous system

• the overall balance of the body

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Key points to remember

Not all inflammatory or allergic reactions are true allergies.

Some are linked to excessive activation of mast cells, which can trigger an inflammatory reaction even in the absence of any real danger.

Understanding these mechanisms opens up new avenues for helping in nutritional and functional biology.